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pthread_mutex_destroy(3) on Linux

The text 3a1848d131e3, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.

operations on mutexes

pthread_mutex_destroy(3) on Linux now